Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b045a1087ae02b9…

MALICIOUS

PDF

92.3 KB Created: 2021-06-28 09:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8ad8223312f717cb51df99393e9b14f1 SHA-1: 2b821c2431b1c1ccaecc636a1915c0766c170409 SHA-256: 4b045a1087ae02b9b86e336acbeefd97a81309c89c9a17c9f480e7685f4dac2a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. The presence of a 'download button' heuristic further supports this phishing-like lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://zaun-produzent.de/userfiles/file/jelit.pdf In PDF document text
    • http://www.chatanakonci.cz/userfiles/file/95961801390.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/0bf1fef579244a245ab8ddc8a26252b0/77908905050.pdfIn PDF document text
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d26bc62308---96670011461.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/60741683919.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fb432d6fd---kivuvigezimesobos.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e953f2bc68---kiwoxawumikadulubuxaxa.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160842eca11287---fusovu.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/9lnj3m188heivbdrqrcf7f04pu/bofuzewevoliremoraxotarub.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606eaac8b6c1f---fivovezekefali.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/51dec0f89934973d7cdc138460ffda79/nedotipadebir.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/2eed8ba76ddf09217e9dbb913786652e/13115643904.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/f21ff84b97068e93adaeb3a360229296/5932547618.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f03cd9b1c---74997964392.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/9hgth7ovi0ckvhq74kgk0rm6tq/wisekimelatakitesojotuz.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16083fea842349---zinuwut.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/k12uma18gg65k9bbus3r2d56d5/61014080289.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/35127098527.pdfIn PDF document text
    • https://kopari.hu/files/file/82548837259.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/39150654040.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/92801647247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=i+let+my+guard+down+i+was+getting+used+to+being+someone+you+lovedPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF51 11048 bytes
SHA-256: 693abb309d67e052f6287fda52b340cff98ca20072f9adb4b8f58a3ab20171d4
font_01_sfnt_off0000f8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DE 23208 bytes
SHA-256: a64e8dc4fc948e55025aa21c7d50b48cbcfd1871d7c944f300fec1e9ca6614b4
font_02_sfnt_off000133d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BE5 16108 bytes
SHA-256: a31e141fb2917ac6221449cb8c95e700680d048453672ad8ad57cd6853c5c53b

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